<!DOCTYPE html>
<html lang="zh-cn">

	<head>
		<meta charset="UTF-8">
		<title class="title">[文件管理器]</title>
		<meta name="viewport"
			content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
		<style type="text/css">
			.content {
				background: transparent;
			}

			.btn {
				position: relative;
				top: 0;
				left: 0;
				bottom: 0;
				right: 0;
			}

			.btn .file {
				position: fixed;
				z-index: 93;
				left: 0;
				right: 0;
				top: 0;
				bottom: 0;
				width: 100%;
				opacity: 0;
			}
		</style>
	</head>

	<body>

		<div id="content" class="content">
			<div class="btn">
				<input :multiple="multiple" @change="onChange" :accept="accept" ref="file" class="file" type="file" />
			</div>
		</div>

		<script type="text/javascript" src="js/vue.min.js"></script>
		<script type="text/javascript">
			let _this;
			var vm = new Vue({
				el: '#content',
				data: {
					accept: '',
					multiple: true,
				},
				mounted() {
					console.log('加载webview');
					_this = this;
					this.files = new Map();
					document.addEventListener('plusready', (e) => {
						let {
							debug,
							instantly,
							prohibited
						} = plus.webview.currentWebview();
						this.debug = debug;
						this.instantly = instantly;
						this.prohibited = prohibited;
						this.accept = prohibited.accept;
						if (prohibited.multiple === 'false') {
							prohibited.multiple = false;
						}
						this.multiple = prohibited.multiple;
						location.href = 'callback?retype=updateOption';
					}, false);
				},
				methods: {
					toast(msg) {
						plus.nativeUI.toast(msg);
					},
					clear(name) {
						if (!name) {
							this.files.clear();
							return;
						}
						this.files.delete(name);
					},
					setData(option = '{}') {
						this.debug && console.log('更新参数：' + option);
						try {
							_this.option = JSON.parse(option);
						} catch (e) {
							console.error('参数设置错误')
						}
					},
					async upload(name = '') {
						if (name && this.files.has(name)) {
							await this.createUpload(this.files.get(name));
						} else {
							for (let item of this.files.values()) {
								if (item.type === 'waiting' || item.type === 'fail') {
									await this.createUpload(item);
								}
							}
						}
					},
					onChange(e) {
						let fileDom = this.$refs.file;
						for (let file of fileDom.files) {
							if (this.files.size >= this.prohibited.count) {
								this.toast(`只允许上传${this.prohibited.count}个文件`);
								fileDom.value = '';
								break;
							}
							this.addFile(file);
						}
						this.uploadAfter();
						fileDom.value = '';
					},
					addFile(file) {
						if (file) {
							const units = {
								KB: 1024,
								MB: 1024 * 1024,
								GB: 1024 * 1024 * 1024,
							};
							let name = file.name;
							this.debug && console.log('文件名称', name, '大小', file.size);
							// 限制文件格式
							let suffix = name.substring(name.lastIndexOf(".") + 1).toLowerCase();
							let formats = this.prohibited.formats.toLowerCase();
							if (formats && !formats.includes(suffix)) {
								this.toast(`不支持上传${suffix.toUpperCase()}格式文件`);
								return;
							}
							// 限制文件大小
							if (file.size > units[this.prohibited.sizeUnit] * Math.abs(this.prohibited.size)) {
								this.toast(`文件大小超过${this.prohibited.size}${this.prohibited.sizeUnit}`)
								return;
							}
							// let itemBlob = new Blob([file]);
							let path = URL.createObjectURL(file);
							this.files.set(file.name, {
								file,
								path,
								fullName: file.name,
								name: file.name,
								size: file.size,
								progress: 0,
								type: 'waiting'
							});
						}
					},
					/**
					 * @returns {Map} 已选择的文件Map集
					 */
					callChange() {
						location.href = 'callback?retype=change&files=' + escape(JSON.stringify([...this.files]));
					},
					/**
					 * @returns {object} 正在处理的当前对象
					 */
					changeFilesItem(item, end = '') {
						this.files.set(item.name, item);
						location.href = 'callback?retype=progress&end=' + end + '&item=' + escape(JSON.stringify(item));
					},
					uploadAfter() {
						this.callChange();
						setTimeout(() => {
							this.instantly && this.upload();
						}, 1000)
					},
					createUpload(item) {
						this.debug && console.log('准备上传,option=：' + JSON.stringify(this.option));
						item.type = 'loading';
						delete item.responseText;
						return new Promise((resolve, reject) => {
							let {
								url,
								name,
								method = 'POST',
								header = {},
								formData = {},
								data = {}
							} = this.option;
							let form = new FormData();
							for (let keys in formData) {
								form.append(keys, formData[keys])
							}
							for (let keys in data) {
								form.append(keys, data[keys])
							}
							form.append(name, item.file);
							let xmlRequest = new XMLHttpRequest();
							xmlRequest.open(method, url, true);
							for (let keys in header) {
								xmlRequest.setRequestHeader(keys, header[keys])
							}
							xmlRequest.upload.addEventListener(
								'progress',
								event => {
									if (event.lengthComputable) {
										let progress = Math.ceil((event.loaded * 100) / event.total)
										if (progress <= 100) {
											item.progress = progress;
											this.changeFilesItem(item);
										}
									}
								},
								false
							);

							xmlRequest.ontimeout = () => {
								console.error('请求超时')
								item.type = 'fail';
								this.changeFilesItem(item, true);
								return resolve(false);
							}

							xmlRequest.onreadystatechange = ev => {
								if (xmlRequest.readyState == 4) {
									this.debug && console.log('接口是否支持跨域', xmlRequest.withCredentials);
									if (xmlRequest.status == 200) {
										this.debug && console.log('上传完成：' + xmlRequest.responseText)
										item['responseText'] = xmlRequest.responseText;
										item.type = 'success';
										this.changeFilesItem(item, true);
										return resolve(true);
									} else if (xmlRequest.status == 0) {
										console.error(
											'status = 0 :请检查请求头Content-Type与服务端是否匹配，服务端已正确开启跨域，并且nginx未拦截阻止请求'
										)
									}
									console.error('--ERROR--：status = ' + xmlRequest.status)
									item.type = 'fail';
									this.changeFilesItem(item, true);
									return resolve(false);
								}
							}
							xmlRequest.send(form)
						});

					}
				}
			});
		</script>
	</body>

</html>